A cikin amfani dahydroxypropyl methyl cellulose HPMC, yawanci muna gano cewa an raba shi zuwa nau'i biyu: narkewa nan take da kuma narkewa a hankali. Bari mu fahimci bambanci tsakanin narkewa cikin sauri da kuma narkewar hydroxypropyl methyl cellulose a hankali.
Nan take HPMC yana nufin amfani da wakili mai haɗa giciye don maganin saman a cikin tsarin samarwa, don haka HPMC za a iya warwatse shi cikin ruwan sanyi da sauri, amma ba mafita ta gaske ba, ta hanyar juyawa iri ɗaya, danko yana ƙaruwa a hankali, wato, narkewa;
Ana iya kiran HPMC mai narkewa a hankali samfuran narke mai zafi. Idan aka haɗu da ruwan sanyi, ana iya watsa shi cikin sauri a cikin ruwan zafi. Ta hanyar juyawa daidai gwargwado, zafin maganin zai ragu zuwa wani zafin jiki. (Zafin gel ɗinmu yana da kusan 60°C), ɗanko zai bayyana a hankali har sai an samar da gel mai haske da mannewa.
Ga bambanci tsakanin mafita nan take da mafita a hankali. Idan kuna da wasu tambayoyi game da wannan ilimin, kuna iya tuntubar mu.
Cellulose na Hydroxypropyl methylHPMCYana jinkirta ruwan siminti
Ƙara hydroxypropyl methyl cellulose a cikin siminti yana rage yawan ruwan da yake sha. To me ka sani game da yadda yake aiki? Bari mu dubi hydroxypropyl methyl cellulose don jinkirta yawan ruwan da ake sha a siminti. Ka'ida.
1. Hasashe game da matsalar motsin ion
Mun yi hasashen cewa hydroxypropyl methyl cellulose zai ƙara dankowar mafita na ramuka, ya hana saurin motsi na ionic, kuma ya jinkirta dakowar siminti. Duk da haka, ƙananan ƙwayoyin cellulose ethers a cikin wannan gwajin suna da ƙarfin da zai iya jinkirta dakowar siminti. Saboda haka, wannan zato ba shi da inganci. Pourchez da sauransu suma suna shakkar wannan hasashe. A gaskiya ma, lokacin ƙaura ko ƙaura na ion yana da ɗan gajeren lokaci, a bayyane yake ba ya bambanta da jinkirin dakowar siminti.
2. Rushewar Alkaline
Polysaccharides suna lalacewa cikin sauƙi a ƙarƙashin yanayin alkaline don samar da hydroxyl carboxylic acid waɗanda ke jinkirta ruwan siminti. Saboda haka, jinkirin ruwan siminti na hydroxypropyl methyl cellulose na iya faruwa ne saboda lalacewarsa a cikin slurries na siminti na alkaline don samar da hydroxycarboxylic acid. Duk da haka, Pourchez da abokan aikinsa sun gano cewa ethers na cellulose suna da ƙarfi sosai a ƙarƙashin yanayin alkaline, sun lalace kaɗan, kuma samfuran lalacewa ba su da tasiri sosai kan jinkirin ruwan siminti.
3, shaƙar iska
Shaye-shaye na iya zama hydroxypropyl methyl cellulose toshe siminti shaye-shaye ainihin dalilin shine yawancin abubuwan da ake ƙarawa a cikin sinadarai na halitta za a shafa su a kan barbashi na siminti da kayayyakin shaye-shaye, suna hana narkewar barbashi na siminti da kuma samar da lu'ulu'u na kayayyakin shaye-shaye, don jinkirta shaye-shaye da danshi na siminti. Pourchez et al. sun gano cewa cellulose ethers suna shaye-shaye cikin sauƙi a saman kayayyakin shaye-shaye kamar calcium hydroxide, CSH gel da calcium aluminate hydrate, amma ba sa shaye-shaye cikin sauƙi ta hanyar ettringite da matakan da ba su da ruwa. Bugu da ƙari, a yanayin cellulose ether, ƙarfin shaye-shaye na HEC ya fi ƙarfin kumburin MC. Ƙananan abubuwan da ke cikin hydroxyethyl a cikin HEC ko hydroxypropyl a cikinHPMC, ƙarfin shaƙar iska mai ƙarfi: game da samfuran shaƙar iska, ƙarfin shaƙar iska mai ƙarfi na calcium hydroxide ya fi na CSH ƙarfi. Ƙarin bincike ya kuma nuna cewa ƙarfin shaƙar iska na samfuran shaƙar iska da cellulose ether yana da alaƙa da jinkirin shaƙar iska mai ƙarfi: ƙarfin shaƙar iska mai ƙarfi, jinkirin da ke bayyane yake, amma shaƙar iska mai ƙarfi ta cellulose ether yana da rauni, amma samuwarsa, amma wannan yana da jinkiri sosai. cellulose ether na tricalcium silicate da samfuran shaƙar iska suna da ƙarfi mai ƙarfi, a bayyane yake yana jinkirta tsarin shaƙar iska na matakin silicate, adadin shaƙar iska mai ƙarfi na ettringite yana da ƙasa sosai, amma jinkirin samuwar ettringite a bayyane yake, saboda jinkirin samuwar ettringite yana shafar daidaiton Ca2+ a cikin maganin, yana da faɗaɗa cellulose ether. Shaƙar iska mai ƙarfi ta silicate ta ci gaba.
Waɗannan su ne ƙa'idar hydroxypropyl methyl cellulose delay siminti. Muna fatan wannan ilimin zai ba kowa damar fahimtar yadda samfurin ke aiki da kuma amfani da shi sosai.
Lokacin Saƙo: Afrilu-26-2024